Thank you, Richard.Taylor and léonie. You are kind to send your thoughtful replies to help me.
Last evening, I found the photos by fortuity. I was reading some Apple articles about the Photos app and came across a reference to multiple photo libraries.
I am embarrassed to say I forgot completely that I had created a second photo library years ago. I used to volunteer at a police department and was their non crime-related photographer for 21 years. Over all those years I had amassed a huge collection of portraits and event photos. And so to declutter and have more direct access to my personal photos I made a separate library for the departmental photos after deleting near duplicates and lesser quality images.
Somehow, though, the Photo widget was pulling half a dozen or so images from that old library rather than only from the one I currently use. And, to add to my mortification, I had not deleted those photos as I had thought. They were all right there to make my face turn red. So I highlighted them and pressed delete. That will hopefully take care of the issue. I still find it odd, though, that the widget selected those few images from that old library I have not used in a very long time.
Again, I thank each of you for taking your time to help.
Varien Tilton